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參數資料
| 型號： | 935269484115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5 |
| 文件頁數： | 20/21頁 |
| 文件大?。?/td> | 298K |
| 代理商： | 935269484115 |
Philips Semiconductors
Product data
SA57251-XX
CMOS switching regulator (PWM controlled)
2001 Aug 01
8
TECHNICAL DISCUSSION
General discussion
The SA57251-XX is a fixed frequency, boost-mode switching power
supply controller. Each device is set to provide a fixed output voltage
by having a fully compensated internal voltage feedback loop. The
SA57251-XX operates at a fixed frequency of 100 kHz and can
operate from a single alkaline cell (0.9 V) or up to 9 V.
The SA57251-XX requires an external NPN bipolar transistor to
provide the switching power waveform. Its internal block diagram is
shown in Figure 19.
The SA57251-XX can be turned off via an ON/OFF pin, thus
allowing the system to unpower portions of the circuitry for added
power savings.
SL01496
2
VREF
5
4
SA57251-XX
GND
FB
PWM CONTROL
SOFT START
R
DRIVE
VDD
ON/OFF
1
Figure 19. Functional diagram.
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